Vacuum cleaner



FIG. 1 is a front and right-side perspective view of a vacuum cleaner showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a left-front view thereof;

FIG. 4 is a left-rear view thereof;

FIG. 5 is a right-side view thereof.

FIG. 6 is a rear view thereof; and,

FIG. 7 is a top view thereof.

The details shown in broken lines form no part of the claimed design. 

We claim the ornamental design for a vacuum cleaner, as shown and described. 